-1, 1 / 2, - 3, 1 / 4, - 5, 1 / 6, - 7, 1 / 8, () is the 15th number? Is the 101st number? Is the 2010 number?

-1, 1 / 2, - 3, 1 / 4, - 5, 1 / 6, - 7, 1 / 8, () is the 15th number? Is the 101st number? Is the 2010 number?

15=14+1,-15;
101=100+1,-101;
2010,1/2010